Fundamentals of industrial electronic circuits / by Walther Richter ... Richter, Walther, writer on electronics. Vacuum-tube circuits. TK7870 .R5 621.3815 RIF "Problems" at end of each chapter except one. "Suggested additional reading" and "References" at end of most of the chapters. New York, London, McGraw-Hill Book Company, inc., c1947. c1947. 1947 Text xviii p., 1 l., 569 p. : eng